Yes, some people prefer to go to TLS because the French Embassy can only cater for a certain number of applications per day.
And, of course, the option to send your documents back via courier is good! It was actually a bit odd because they issued my visa on the same day but asked me to collect my passport the next day. .
This time, I paid VFS an £18.00 service charge coz I can't be bothered going to the German Embassy London (more convenient by post). Again, personal choice.